Title: Married to the Dragon God
Tsuwabuki, the illegitimate child of the head of the wolf family to a lion-dog mistress mother, is a lion-dog. His life as a young child starts out well enough with the protection of his mother, but when she dies, his worth to the family severely declines. Though he's related to the legitimate children of the family head, he is treated just like any other servant, except by his half-sister, who bullies him incessantly just because she can. Tsuwabuki does his best to ignore her taunts, serving the wolf family as best he can while honoring the god of the mountain they live on, just as his mother taught him when he was a small child. He's perfectly content with his life, though he secretly longs for a bit more freedom and the affection he lost when his mother passed.
The members of the wolf family are considered the divine messengers of god, so it only makes sense that they are called upon to offer a bride to the god in order to heal him of his impurities. The god specifically requests the youngest child, who happens to be Tsuwabuki's cruel older sister. She doesn't want to marry the god and is disgusted by the idea of having to cleanse the impure god, as it requires having sex. Instead, she demands that they offer Tsuwabuki, as he is also a child of the wolf family. Without a word, Tsuwabuki accepts his new role.
After being taken underwater, a gateway to where the mountain god Shuro resides, Tsuwabuki is married and bedded. Though Tsuwabuki doesn't feel worthy of being Shuro's bride, Shuro assures him that no one else could be worthy enough to be by his side. Still, Tsuwabuki is sure that there is a better bride for Shuro. As it happens, his elder sister is sacrificed to marry Shuro after the wolf family is destroyed. Tsuwabuki is sure his sister would be better for Shuro, but deep inside, Tsuwabuki loves Shuro and wants him all to himself.
Does Shuro really need Tsuwabuki? And even if he doesn't, can Tsuwabuki let Shuro go?